There is not currently a feature to mute @mentions. However depending on your use-case you might consider posting to the thread stating that additional questions should be raised by creating a new discussion. This might help detour other members from @mentioning them on the thread. Once the comment has been posted, they could decide to Lock the discussion to prevent future people from commenting on it.
Or if this is a feature you would like to see in a future release, you can suggest the idea for it here Ideas for Jive. This will allow others to vote it up and help it gain visibility with our Products team.
Hope this helps.
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Be sure to let people know that they might need to join the customer list by adding their names here if they can't access Ideas for Jive.
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